Mechanical behavior of fuel cell membranes under humidity cycles and effect of swelling anisotropy on the fatigue stresses
Mechanical behavior of fuel cell membranes under humidity cycles and effect of swelling anisotropy on the fatigue stresses
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DOI：
10.1016/j.jpowsour.2007.03.063
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发表时间：
2007-07-10
影响因子：
9.2
通讯作者：
Johnson, William B.
中科院分区：
文献类型：
--
作者：
Kusoglu, Ahmet;Karlsson, Anette M.;Johnson, William B.
在恒定温度（85 ℃）下的湿度循环下，研究了燃料电池组件中的质子交换膜的机械响应。通过施加从阴极到阳极的湿度梯度来模拟膜在水合-脱水循环下的行为。线性弹性。具有各向同性硬化的塑性本构行为以及温度和湿度相关的材料特性被用于膜的模拟中。的应力和塑性变形的演变过程中的湿度周期确定使用有限元分析两种夹紧方法和各种程度的溶胀各向异性。膜响应强烈地依赖于溶胀各向异性，其中应力振幅随着各向异性的增加而减小。这些结果表明，它可以优化膜的溶胀各向异性，以实现更好的抗疲劳性，潜在地提高燃料电池膜的耐久性。(c)2007 Elsevier B. V.保留所有权利。
The mechanical response of proton exchange membranes in a fuel cell assembly is investigated under humidity cycles at a constant temperature (85 degrees C). The behavior of the membrane under hydration-dehydration cycles is simulated by imposing a humidity gradient from the cathode to the anode. Linear elastic. plastic constitutive behavior with isotropic hardening and temperature and humidity dependent material properties are utilized in the simulations for the membrane. The evolution of the stresses and plastic deformation during the humidity cycles are determined using finite element analysis for two clamping methods and various levels of swelling anisotropy. The membrane response strongly depends on the swelling anisotropy where the stress amplitude decreases with increasing anisotropy. These results suggest that it may be possible to optimize a membrane with respect to swelling anisotropy to achieve better fatigue resistance, potentially enhancing the durability of fuel cell membranes. (c) 2007 Elsevier B.V. All rights reserved.